When ChatGPT says "too many concurrent requests," it means the system is receiving more simultaneous requests than it can handle at the same time. This usually happens when multiple requests are sent in rapid succession, from multiple browser tabs or devices under one account, automated tools, or heavy user traffic causing the system to be overloaded. It is a deliberate technical limit to ensure stable performance, fair resource allocation, and prevent server overload by restricting how many active requests can be processed simultaneously per user or API key. In practice, this means that before previous requests are completed, new incoming requests exceed the allowed concurrency threshold, causing ChatGPT to temporarily block additional ones until the ongoing requests finish. The exact limit of concurrent requests depends on the type of user account and service plan, with higher plans allowing more simultaneous interactions. To resolve or avoid this, users can:

• Wait a moment and retry requests.
• Avoid sending multiple inputs in rapid succession.
• Close extra browser tabs or sessions running ChatGPT.
• Use fewer automated or batch requests.
• Upgrade to a plan with higher limits if needed.

This concurrency control helps maintain consistent access and quality of service for all users by managing resource load efficiently.